# Perimeter Formulas for Geometric Figures

Perimeter of a geometric figure

- is the continuous line forming the boundary of a closed geometrical figure.
Perimeter Formulas for Geometric Figures:
Perimeter of a triangle
Perimeter of a square
Perimeter of a rectangle
Perimeter of a parallelogram
Perimeter of a rhombus
Perimeter of a trapezoid
Perimeter of a circle (Circumference)

## Perimeter of a triangle

**The perimeter of the triangle** ∆ABC is the sum of the lengths of its sides

**P = a + b + c**

## Perimeter of a square

**The perimeter of a square** is the product of the length of a square side by 4.

**P = 4a**

**The perimeter of a square** is the product of the length of a square diagonal by 2√2.

**P = 2√2 d**

where P - perimeter of a square,

a - the lenth of a square side,

d - the length of a square diagonal.

## Perimeter of a rectangle

**The perimeter of the rectangle** ABCD is equal to twice the sum of the sides adjacent to one corner.

**P = 2(a + b)**

where P - perimeter of a rectangle,

a, b - the length of rectangle sides,i.e., the height and width accordingly.

## Perimeter of a parallelogram

**Perimeter of the parallelogram** ABCD is equal to twice the sum of the sides adjacent to one corner.

**P = 2(a + b)**

where P - perimeter of a parallelogram,

a, b - lengths of parallelogram sides.

## Perimeter of a rhombus

**The perimeter of a rhombus** is equal to the product of the length of its side into four.

P = 4a

where P - perimeter of a rhombus,

a - the length of a rhombus side.

## Perimeter of a trapezoid

**The perimeter of a trapezoid** is equal to the sum of the lengths of its sides.

P = a + b + c + d

where P - perimeter of a trapezoid,

a, b - the length of 2 trapezoid bases,i.e., the parallel sides,

c, d - length of the legs (the lateral sides).

## Perimeter of a circle (Circumference)

**P = 2 π r****P = π d**

where P - perimeter of a circle,

r - the length of the circle radius,

d - the length of the circle diameter,

π = 3.141592.

Geometry formulas
Square. Formulas and Properties of a Square
Rectangle. Formulas and Properties of a Rectangle
Parallelogram. Formulas and Properties of a Parallelogram
Rhombus. Formulas and Properties of a Rhombus
Circle, disk, segment, sector. Formulas and properties
Ellipse. Formulas and properties of ellipse
Cylinder. Formulas and properties of a cylinder
Cone. Formulas, characterizations and properties of a cone
Area. Formulas of area
Perimeter. Formulas of perimeter
Volume. Formulas of volume
Surface Area Formulas

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